Code not working all of a sudden zoho.crm.searchRecordsByPDC/contactid - CRITICAL - disappointing response from support (waiting 3 days)

Code not working all of a sudden zoho.crm.searchRecordsByPDC/contactid - CRITICAL - disappointing response from support (waiting 3 days)

Hello, 

I have emailed support, and submitted an online request for help - I marked both as critical...and still, 3 days later, have heard nothing back from support...very disappointing...I am quite an advocate for the Zoho tool suite...but must concede that the support aspect is quite hit and miss...I am a paying customer and I realise the service is at a favourable price point but I still think a 24 hour turn-around (even an automated response to say it's in the queue) would help. How so ever...

I have been using the function below for several months now without any problem....not it has started to issue an error 'Invalid Parameter'...

I have run a test and here is the error...has something changed with searchRecordsByPDC when using the 'contactid' field???

Executed Successfully
Return Value:
{4832=Invalid parameter value}

map roundmanagement. GetCRMContactRecordByContactID(string CONTACTID)
{
    ContactsList = zoho.crm.searchRecordsByPDC(" Contacts", "contactid", input.CONTACTID);
    contact = ContactsList.get(0);
    return contact;
}

In hope, thanks, Liam.